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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd608e7acba08f96da9df9c9061558b00f0c19d4bf0010e9cc5a44eac3f0b8d8' 
  AND token = 'bd6vcz7P17RgJCBsWmVFoVMZChx3NrQy24CmmerfWMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}